firing vs removal

firing and removal both are nouns.

Word	Noun	Adjective	Verb	Adverb
firing	Yes	No	No	No
removal	Yes	No	No	No

As nouns, removal is a hyponym of firing; that is, removal is a word with a more specific, narrower meaning than firing:

firing: the termination of someone's employment (leaving them free to depart)
removal: dismissal from office

firing (noun)	removal (noun)
the act of setting something on fire	the act of removing
the termination of someone's employment (leaving them free to depart)	dismissal from office
the act of discharging a gun
the act of firing weapons or artillery at an enemy